BCU 523753.16 – Raising Deadband Too High in M08 Stepper Motor for Hitch During Calibration. John Deere System Advisory.

BCU 523753.16 (BCU )

Code: 523753.16



The diagnostic trouble code BCU 523753.16 is generated when the raising deadband—defined as the play between the adjustment cam of the stepper motor and the raise valve of the hitch valve—is found to be excessively large during calibration of the stepper motor for the hitch. This condition indicates that the gap is greater than the operational specifications allow, which can lead to inefficiencies in hitch operation and potential instability or lack of precision when adjusting hitch height.


The BCU may limit the functionality of the hitch control to prevent potential overextension or damage due to the excessive play in the system. This may also trigger additional warnings to alert the operator to the issue.


  • Inspect Mechanical Components: Thoroughly check the mechanical linkages and components involved in the hitch’s raise and lower mechanism, particularly focusing on the stepper motor adjustment cam and raise valve.
  • Adjust Deadband: If possible, make mechanical adjustments to reduce the deadband to within the specified tolerances. This may involve adjusting the position of the cam or tightening loose components.
  • Calibrate the Hitch System: After making any mechanical adjustments, recalibrate the hitch system to ensure that the deadband is correctly set and the entire system operates smoothly.
  • Test Hitch Operation: Operate the hitch through its full range of motion to ensure that the adjustments have corrected the problem and that the hitch responds accurately to control inputs.
  • Regular Maintenance: Implement a regular maintenance schedule to check and adjust the hitch mechanism, preventing similar issues from developing in the future.


Maintaining precise control over hitch operations is crucial for efficient tractor performance, especially when handling various implements. Regular checks and adjustments of the hitch mechanism components can prevent operational delays and ensure the machinery operates within optimal parameters. Addressing calibration issues promptly helps maintain the performance and functionality of the hitch system.